### 计算机代写|Java代写|Introducing Data Types and Operators

Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。

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• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 计算机代写|Java代写|The Boolean Type

The boolean type represents true/false values. Java defines the values true and false using the reserved words true and false. Thus, a variable or expression of type boolean will be one of these two values.
Here is a program that demonstrates the boolean type:
// Demonstrate boolean values.
class Booldemo {
public static void main(String[] args) {
boolean $\mathrm{b}$;
$b=$ false $;$
system.out.println(“b is ” $+$ b);
$\mathrm{b}=$ true;
System.out.println(“b is ” + b);
$/ /$ a boolean value can control the if statement
if (b) system. out. println(“This is executed.”);
$b=$ false;
if (b) System.out.println(“This is not executed.”);
// outcome of a relational operator is a boolean value
System.out.println(” $10>9$ is ” $+(10>9))$;
}
}
The output generated by this program is shown here:
$b$ is false
$b$ is true
This is executed.
$10>9$ is true

There are three interesting things to notice about this program. First, as you can see, when a boolean value is output by println( ), “true” or “false” is displayed. Second, the value of a boolean variable is sufficient, by itself, to control the if statement. There is no need to write an if statement like this:
if $(b==$ true $) \ldots$
Third, the outcome of a relational operator, such as $<$, is a boolean value. This is why the expression $10>9$ displays the value “true.” Further, the extra set of parentheses around $\mathbf{1 0}>\mathbf{9}$ is necessary because the + operator has a higher precedence than the $>$.

## 计算机代写|Java代写|Literals

In Java, literals refer to fixed values that are represented in their human-readable form. For example, the number 100 is a literal. Literals are also commonly called constants. For the most part, literals, and their usage, are so intuitive that they have been used in one form or another by all the preceding sample programs. Now the time has come to explain them formally.
Java literals can be of any of the primitive data types. The way each literal is represented depends upon its type. As explained earlier, character constants are enclosed in single quotes. For example, ‘a’ and ‘ $\%$ ‘ are both character constants.
Integer literals are specified as numbers without fractional components. For example, 10 and $-100$ are integer literals. Floating-point literals require the use of the decimal point followed by the number’s fractional component. For example, $11.123$ is a floating-point literal. Java also allows you to use scientific notation for floating-point numbers.

By default, integer literals are of type int. If you want to specify a long literal, append an 1 or an L. For example, 12 is an int, but $12 \mathrm{~L}$ is a long.

By default, floating-point literals are of type double. To specify a float literal, append an F or $\mathrm{f}$ to the constant. For example, 10.19F is of type float.

Although integer literals create an int value by default, they can still be assigned to variables of type char, byte, or short as long as the value being assigned can be represented by the target type. An integer literal can always be assigned to a long variable.

You can embed one or more underscores into an integer or floating-point literal. Doing so can make it easier to read values consisting of many digits. When the literal is compiled, the underscores are simply discarded. Here is an example:
123_45_1234
This specifies the value $123,451,234$. The use of underscores is particularly useful when encoding things like part numbers, customer IDs, and status codes that are commonly thought of as consisting of subgroups of digits.

## 计算机代写|Java代写|Hexadecimal, Octal, and Binary Literals

As you may know, in programming it is sometimes easier to use a number system based on 8 or 16 instead of 10 . The number system based on 8 is called octal, and it uses the digits 0 through 7. In octal the number 10 is the same as 8 in decimal. The base 16 number system is called hexadecimal and uses the digits 0 through 9 plus the letters $\mathrm{A}$ through $\mathrm{F}$, which stand for 10,11 , $12,13,14$, and 15. For example, the hexadecimal number 10 is 16 in decimal. Because of the frequency with which these two number systems are used, Java allows you to specify integer literals in hexadecimal or octal instead of decimal. A hexadecimal literal must begin with $\mathbf{0 x}$ or $\mathbf{0 X}$ (a zero followed by an $\mathbf{x}$ or $\mathrm{X}$ ). An octal literal begins with a zero. Here are some examples:
hex $=0 \mathrm{XFF} ; / / 255$ in decimal
oct $=011 ; / / 9$ in decimal
hex $=0 x F F ; / / 255$ in decimal
oct $=011 ; / / 9$ in decimal
As a point of interest, Java also allows hexadecimal floating-point literals, but they are seldom used.

It is possible to specify an integer literal by use of binary. To do so, precede the binary number with a $\mathbf{0 b}$ or $\mathbf{0 B}$. For example, this specifies the value 12 in binary: $\mathbf{0 b} 1100$.

Enclosing character constants in single quotes works for most printing characters, but a few characters, such as the carriage return, pose a special problem when a text editor is used. In addition, certain other characters, such as the single and double quotes, have special meaning in Java, so you cannot use them directly. For these reasons, Java provides special escape sequences, sometimes referred to as backslash character constants, shown in Table 2-2. These sequences are used in place of the characters that they represent.

## 计算机代写|Java代写|The Boolean Type

// 演示布尔值。

public static void main(String[] args) {
booleanb;
b=错误的;
system.out.println(“b 是”+b);
b=真的;
System.out.println(“b 是” + b);
//一个布尔值可以控制 if 语句
if (b) 系统。出去。println(“执行完毕”);
b=错误的;
if (b) System.out.println(“这没有被执行。”);
// 关系运算符的结果是一个布尔值
System.out.println(”10>9是 ”+(10>9));

b是假的
b是 true

10>9是真的

if(b==真的)…

## 计算机代写|Java代写|Literals

Java 文字可以是任何原始数据类型。每个文字的表示方式取决于其类型。如前所述，字符常量用单引号括起来。例如，’a’ 和 ‘%’ 都是字符常量。

123_45_1234

_=011;//9十进制

_=011;//9以十进制

## 有限元方法代写

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。